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       mbsrtowcs.c - scc - simple c99 compiler
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       ---
       mbsrtowcs.c (453B)
       ---
            1 #include <limits.h>
            2 #include <wchar.h>
            3 
            4 #undef mbsrtowcs
            5 
            6 size_t
            7 mbsrtowcs(wchar_t *restrict dest, const char **restrict src, size_t len,
            8           mbstate_t *restrict ps)
            9 {
           10         wchar_t wc;
           11         size_t cnt, n;
           12 
           13         for (n = 0; ; n++) {
           14                 cnt = mbrtowc(&wc, *src, MB_LEN_MAX, ps);
           15                 if (cnt == (size_t) -1)
           16                         return -1;
           17 
           18                 if (dest) {
           19                         if (n == len)
           20                                 return n;
           21                         *dest++ = wc;
           22                 }
           23                 *src += cnt;
           24 
           25                 if (wc == L'\0')
           26                         break;
           27         }
           28         *src = NULL;
           29 
           30         return n;
           31 }